diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/generators/bug908920.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/generators/bug908920.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+if (typeof schedulegc != 'undefined') {
+    Function("\
+        x = (function() { yield })();\
+        Set(x);\
+        schedulegc(1);\
+        print( /x/ );\
+        for (p in x) {}\
+    ")();
+}